CN214503193U

CN214503193U - Test piece fixing mechanism and asphalt mixture creep testing device with same

Info

Publication number: CN214503193U
Application number: CN202120716616.4U
Authority: CN
Inventors: 马云铭; 王宏畅
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-10-26
Anticipated expiration: 2031-04-08

Abstract

The utility model relates to the technical field of asphalt creep test, in particular to a test piece fixing mechanism and an asphalt mixture creep test device with the same, which comprises a universal material testing machine, wherein the universal material testing machine is provided with the fixing mechanism, the fixing mechanism comprises a base, the base is detachably connected with a placing cylinder for placing an asphalt test piece, the upper end and the lower end of the placing cylinder are open, and the upper end part of the placing cylinder is provided with a pressure head for placing the upper end part of the asphalt test piece; still be equipped with the installing support among the universal material testing machine, be equipped with the pneumatic cylinder on the installing support, the tip of pneumatic cylinder piston rod is equipped with the depression bar, and universal material testing machine's upper end is equipped with heating mechanism, and heating mechanism includes the shell body, is equipped with heating wire and fan in the shell body. The utility model discloses the promotion of preferred pitch creep test data's accuracy to this kind of restraint has imitated the effect of wheel load to the road surface well, makes the result of pitch creep test more accurate.

Description

Test piece fixing mechanism and asphalt mixture creep testing device with same

Technical Field

The utility model relates to a bituminous mixture creep test technical field, specifically speaking relates to a test piece fixed establishment and have bituminous mixture creep testing arrangement of this mechanism.

Background

At present, creep test equipment adopted by the creep test of the asphalt mixture is generally a universal material testing machine, and the temperature required by the test is reached through heating and heat preservation of a test piece; forming a test piece by a rotary compaction instrument; cutting machines and core drilling machines, etc.

The testing steps include the following steps: (1) obtaining a 150x100mm test piece by adopting a cutting and core drilling method, and selecting a 42x50mm pressure head; (2) placing the test piece into a pneumatic servo universal material testing machine, adjusting the temperature to the testing temperature, keeping the temperature for 5-6 hours, and placing the pressure head into a constant-temperature water tank before testing to enable the pressure head to reach the testing temperature; (3) adjusting the position of the test piece to enable the pressure head to be aligned to the center of the test piece, paving a plastic film at the loading position, and coating a lubricant on the pressure head to prevent the loading position from contacting the test piece to be viscous; (4) prepressing for 5 minutes under 0.2MPa, and unloading for half an hour; (5) instantly loading to 0.7MPa, and unloading after loading for 60 minutes; (6) and (6) data processing.

When carrying out the creep test to bituminous mixture, because place in universal material testing machine between the test piece, lack the fixing device to the bituminous mixture test piece, when the extrusion bituminous mixture test piece, bituminous mixture test piece edge can produce the inflation to cause the interference to bituminous mixture creep test's data.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a test piece fixing mechanism comprises a base, wherein a placing barrel for placing an asphalt mixture test piece is detachably connected to the base, the upper end and the lower end of the placing barrel are open, and a pressure head for placing the upper end of the asphalt mixture test piece is arranged at the upper end of the placing barrel; the upper end face of base is equipped with the annular groove that is used for the installation to place a section of thick bamboo, is equipped with on the lateral wall of base with the communicating spacing screw of annular groove, place be equipped with in the section of thick bamboo with spacing screw matched with spacing blind hole, the cooperation is equipped with spacing screw in the spacing screw, spacing screw's tip stretches into in the spacing blind hole.

The utility model discloses avoided the edge of bituminous mixture test piece to take place deformation or the bituminous mixture test piece takes place to remove and produces great influence to creep test's data in carrying out creep test to the promotion of preferred bituminous mixture creep test data's accuracy, and this kind of restraint has imitated the effect of wheel load to the road surface well, makes bituminous mixture creep test's result more accurate.

Wherein, the sectional area of pressure head is the atress area of pitch test piece.

Wherein, through spacing screw, spacing blind hole and spacing screw between the cooperation, comparatively convenient realization the base with place being connected between the section of thick bamboo.

Preferably, the upper end of the placing barrel is detachably connected with an annular plate, the center of the annular plate is provided with a limiting barrel in clearance fit with the pressure head, and the diameter of the inner wall of the limiting barrel is the same as that of the inner wall of the annular plate.

The utility model discloses in, through the setting of annular plate and spacing section of thick bamboo, the promotion of preferred bituminous mixture creep test data's accuracy.

Through placing the removable connection between a section of thick bamboo and the annular plate, the preferred promotion this fixed establishment's suitability.

Preferably, the upper end face of the placing barrel is provided with a plurality of fixing blind holes which are uniformly distributed, and the bottom face of the annular plate is provided with fixing columns matched with the fixing blind holes.

The utility model discloses in, through the cooperation between fixed blind hole and the fixed column, comparatively convenient completion to the annular plate with place being connected between the section of thick bamboo.

Preferably, the bottom end of the fixing column is inwards recessed along the circumferential direction to form a clamping groove, a fixing screw hole communicated with the fixing blind hole is formed in the side wall of the placing barrel, a fixing screw is arranged in the fixing screw hole in a matched mode, and the end portion of the fixing screw abuts against the clamping groove.

The utility model discloses in, through the setting of fixed screw and fixed screw, comparatively convenient realization to the installation and the dismantlement of annular plate.

Preferably, the center of the upper end surface of the pressure head is provided with a pressure head groove.

The utility model discloses in, through the setting of pressure head recess, can the preferred with the depression bar on the universal material testing machine cooperate.

The utility model also provides a creep testing device for asphalt mixture, which comprises a universal material testing machine, wherein a test piece fixing mechanism is arranged in the universal material testing machine; still be equipped with the installing support among the universal material testing machine, be equipped with the vertical pneumatic cylinder that sets up downwards on the installing support, the tip of pneumatic cylinder piston rod is equipped with the depression bar, and universal material testing machine's upper end is equipped with heating mechanism, and heating mechanism includes the shell body, is equipped with the heating wire in the shell body and enters the fan among the universal material testing machine with the air drum in the shell body.

The utility model discloses in, through set up test piece fixed establishment in universal material testing machine, comparatively accurate realization to the measurement of pitch creep data.

Drawings

Fig. 1 is a schematic structural diagram of an asphalt creep test apparatus in example 1.

FIG. 2 is a front view of the asphalt creep test apparatus of FIG. 1.

Fig. 3 is a sectional view of the specimen fixing mechanism in example 1.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic view of the indenter of fig. 2.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention only and are not limiting.

Example 1

As shown in fig. 1 to 5, the present embodiment provides a test piece fixing mechanism, which includes a base 210, a placing cylinder 220 for placing an asphalt mixture test piece is detachably connected to the base 210, openings are formed at upper and lower ends of the placing cylinder 220, and a pressing head 230 for placing an upper end of the asphalt mixture test piece is disposed at an upper end of the placing cylinder 220.

When the test piece fixing mechanism in this embodiment is used, the base 210 and the placing cylinder 220 are connected together, then the base 210 is placed into the universal material testing machine 110, the manufactured asphalt mixture test piece is placed into the placing cylinder 220, the pressure head 230 heated by the water bath is placed above the asphalt mixture test piece, and then the started universal material testing machine 110 performs a creep test on the asphalt mixture test piece. The test piece fixing mechanism in this embodiment is through placing the cooperation between a section of thick bamboo 220 and the base 210, the realization of preferred is fixed to the bituminous mixture test piece, avoided the bituminous mixture test piece to take place deformation or the bituminous mixture test piece takes place to remove and produces great influence to creep test's data in the edge of bituminous mixture test piece carrying out creep test, thereby the promotion of preferred bituminous mixture creep test data's accuracy, and this kind of restraint has imitated the effect of wheel load to the road surface well, make bituminous mixture creep test's result more accurate.

The sectional area of the pressure head 230 is the stressed area of the asphalt mixture test piece.

In this embodiment, the upper end surface of the base 210 is provided with an annular groove 310 for installing the placing cylinder 220, the side wall of the base 210 is provided with a limiting screw hole 320 communicated with the annular groove 310, the placing cylinder 220 is provided with a limiting blind hole 330 matched with the limiting screw hole 320, the limiting screw hole 320 is provided with a limiting screw 340 in a matching manner, and the end of the limiting screw 340 extends into the limiting blind hole 330.

When the fixing mechanism in this embodiment is used, the lower end of the placing cylinder 220 can be placed in the annular groove 310, and then the end of the limiting screw 340 is screwed into the limiting blind hole 330 to limit the placing cylinder 220. In this embodiment, the base 210 and the placing barrel 220 are conveniently connected by the matching of the limiting screw hole 320, the limiting blind hole 330 and the limiting screw 340.

In this embodiment, the upper end of the placing cylinder 220 is detachably connected with an annular plate 350, a limiting cylinder 360 in clearance fit with the pressure head 230 is arranged at the center of the annular plate 350, and the diameter of the inner wall of the limiting cylinder 360 is the same as that of the inner wall of the annular plate 350.

When the fixing component in the embodiment is used, the annular plate 350 can be installed at the upper end part of the placing cylinder 210, then the pressure head 230 is placed into the limiting cylinder 360, the creep test of asphalt mixture is avoided, the pressure head 230 is displaced due to the deformation of the asphalt mixture test piece, the pressure head 230 can always vertically face the asphalt mixture component, and therefore the accuracy of the creep test data of the asphalt mixture is improved. Several different sizes of annular plates 350 are provided in this implementation, with the differences between the different sizes of annular plates 350 being: the annular plate 350 defines a difference in the diameter of the inner wall of the retention cylinder 360. By placing the detachable connection between the barrel 220 and the annular plate 350, the fixing mechanism in the present embodiment can be preferably applied to the pressing heads 230 with different diameters, thereby preferably improving the applicability of the fixing mechanism.

In this embodiment, the upper end surface of the placing cylinder 220 is provided with a plurality of fixing blind holes 410 which are uniformly distributed, the bottom surface of the annular plate 350 is provided with fixing posts 420 which are matched with the fixing blind holes 410, the bottom ends of the fixing posts 420 are inwards recessed along the circumferential direction to form clamping grooves 430, the side wall of the placing cylinder 220 is provided with fixing screw holes 440 which are communicated with the fixing blind holes 410, fixing screws 450 are matched with the fixing screw holes 440, and the ends of the fixing screws 450 are abutted into the clamping grooves 430.

When the fixing mechanism in this embodiment is used, the annular plate 350 may be placed on the placing cylinder 220, so that the end of the fixing post 420 extends into the fixing blind hole 410, and then the fixing screw 450 is screwed on, so that the fixing post 420 is fixed by the fit between the fixing screw 450 and the locking groove 430. In this embodiment, the installation and detachment of the annular plate 350 are conveniently achieved by the arrangement of the fixing blind holes 410, the fixing screws 450 and the fixing screw holes 440.

In this embodiment, a ram groove 510 is formed in the center of the upper end surface of the ram 230.

Through the arrangement of the indenter groove 510 in the present embodiment, it can be better matched with the pressing rod 260 on the universal material testing machine 110.

The embodiment also provides a device for testing the creep of the asphalt mixture, which comprises a universal material testing machine 110, wherein a test piece fixing mechanism is arranged in the universal material testing machine 110; still be equipped with installing support 240 in the universal material testing machine 110, be equipped with vertical decurrent pneumatic cylinder 250 that sets up on installing support 240, the tip of pneumatic cylinder 250 piston rod is equipped with depression bar 260, and the upper end of universal material testing machine 110 is equipped with heating mechanism, and heating mechanism includes shell body 120, is equipped with the heating wire in the shell body 120 and enters the fan in the universal material testing machine with the air drum in the shell body.

When the asphalt mixture creep testing device in the embodiment is used, an asphalt mixture test piece can be placed in the fixing mechanism, then the fixing mechanism is placed in the universal material testing machine 110, then the temperature in the universal material testing machine 110 is maintained through the heating mechanism, and the hydraulic cylinder 250 is driven through the control mechanism 130, so that the pressing rod 260 on the hydraulic cylinder 250 abuts against the pressing head 230 to perform an asphalt mixture creep test. The asphalt mixture creep testing device in the embodiment can accurately realize the measurement of asphalt mixture creep data by arranging the test piece fixing mechanism in the universal material testing machine 110.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. Test piece fixed establishment, its characterized in that: the asphalt mixture test piece placing device comprises a base (210), wherein a placing barrel (220) used for placing an asphalt mixture test piece is detachably connected to the base (210), the upper end and the lower end of the placing barrel (220) are open, and a pressure head (230) used for placing the upper end part of the asphalt mixture test piece is arranged at the upper end part of the placing barrel (220); the upper end face of base (210) is equipped with annular groove (310) that is used for the installation to place a section of thick bamboo (220), is equipped with on the lateral wall of base (210) with communicating spacing screw (320) of annular groove (310), place be equipped with in a section of thick bamboo (220) with spacing screw (320) matched with spacing blind hole (330), the cooperation is equipped with spacing screw (340) in spacing screw (320), the tip of spacing screw (340) stretches into in spacing blind hole (330).

2. The specimen holding mechanism according to claim 1, characterized in that: the upper end of the placing barrel (220) is detachably connected with an annular plate (350), the center of the annular plate (350) is provided with a limiting barrel (360) in clearance fit with the pressure head (230), and the diameter of the inner wall of the limiting barrel (360) is the same as that of the inner wall of the annular plate (350).

3. The specimen holding mechanism according to claim 2, characterized in that: the upper end surface of the placing barrel (220) is provided with a plurality of fixing blind holes (410) which are uniformly distributed, and the bottom surface of the annular plate (350) is provided with fixing columns (420) which are matched with the fixing blind holes (410).

4. The specimen holding mechanism of claim 3, wherein: the bottom end of the fixing column (420) is inwards recessed along the circumferential direction to form a clamping groove (430), a fixing screw hole (440) communicated with the fixing blind hole (410) is formed in the side wall of the placing barrel (220), a fixing screw (450) is arranged in the fixing screw hole (440) in a matched mode, and the end portion of the fixing screw (450) abuts against the clamping groove (430).

5. The specimen holding mechanism according to claim 1, characterized in that: the center of the upper end surface of the pressure head (230) is provided with a pressure head groove (510).

6. Asphalt mixture creep testing arrangement, its characterized in that: the universal material testing machine comprises a universal material testing machine (110), wherein a test piece fixing mechanism as claimed in any one of claims 1 to 5 is arranged in the universal material testing machine (110); still be equipped with installing support (240) in universal material testing machine (110), be equipped with vertical pneumatic cylinder (250) that set up downwards on installing support (240), the tip of pneumatic cylinder (250) piston rod is equipped with depression bar (260), the upper end of universal material testing machine (110) is equipped with heating mechanism, heating mechanism includes shell body (120), is equipped with the heating wire in shell body (120) and with the shell body in the fan of air drum in the universal material testing machine.